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Cyber Security 7 min read
Email Security to Stop BEC with DMARC and Impersonation Controls
How to build email security that stops Business Email Compromise without drowning staff in false positives.
Business Email Compromise (BEC) is where the money is for attackers. A convincing fake invoice, a spoofed CEO, a supplier whose bank details ‘just changed’ — these cost UK businesses millions every year.
Start with authentication
- SPF to say who can send from your domain.
- DKIM to sign your mail so it can't be tampered with in transit.
- DMARC to tell receivers what to do when SPF or DKIM fail — reject, quarantine or monitor.
Stop the impersonation
Beyond authentication, AI-driven filtering catches lookalike domains, display-name spoofing, and tone-shift attacks that a rule-based gateway misses — without burying your team in false positives.
What good looks like
- DMARC at p=reject with monitored reporting.
- Inbound filtering that quarantines suspicious mail before the inbox.
- Banner warnings on external mail that looks like internal staff.
- One-click report-phishing so your team flags threats fast.
We layer these controls together so the dodgy email never reaches the inbox, and the real ones get through.
